HP proone 400 g2 Maintenance & Service Manual page 79

17. Disengage the tabs along the sides that secure the bezel to the frame. Tabs are as follows:
(6) 5 tabs along the left side
(7) 6 tabs along the top
(8) 2 tabs on the right side
CAUTION: Touch displays have two cables connected to them. Due to the short length of the touch
cable, you must disconnect it before you separate the display from the frame. Failure to do so may result
in damage to the connector on the display.
18. Separate the main frame from the bezel.
Display panel, touch 69